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Reduces the number of allocations and calls into QLocale. The cost are
two maps with 7 and 12 QStrings respectively, which can be reused for
the whole life-time of the Model.

Summary:
1) commit b78a77e95659 in kdelibs 4.9.2 (see bug 270473) takes
care of making KCompletionBox move/resize when the parent widget has moved/resized.

2) this hack made the completion popup not appear for me, the very first time.
After hide()+show(), isVisible() was true, but the popup wasn't actually visible
(geometry was correct though). Possibly a Qt issue, but that's what we get when
doing hacks.
Worse, this broke the Tab key to focus the next field, since the code thought
it was about tabbing through the presumed-to-be-visible completion box.

since the timezone offset can be negative.

I'll move the connect there, it'll make more sense.

Set Recipient::name and Recipient::email respectively.